I have read your article (http://ideacandi.com/blogzero/?p=44) with lots of attention: Thank you! I (and my team) are facing the same issue:
How to unit test asynchronous calls to SFS server via java client?

Thanks for your comments and links.
As regards the Java API they where not aimed at providing a Unit Testing tool.

As you might have already noticed from some of our posts we are working on a major new release which will take a significant leap forward in all departments. On of them will certainly be Java Extension development which will see big improvements. (At the moment I am not allowed to say much more than this but it shouldn't take much before we can release more details)

Back to the topic I think unit testing of asynchronous code would be an cool feature and we are interested in providing a solution for it. It is still a bit premature at this point of our road map as we have lots of other priorities but we'll definitely put in the queue for later discussion and analysis.

Sorry, this post was started more than 6 months ago You are referring to the Java API client classes.
Here you go --> http://www.smartfoxserver.com/labs/API/Scroll down a bit until you see the Java logo